How hard is the water in Conroe, TX?

Tap water hardness
82mg/L
4.8gpg
Moderately hardReports range 82–99

Reported by City of Conroe · June 2025

TX typical
112 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Tap water in Conroe has about 82 mg/L of hardness, which is 4.8 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from City of Conroe, dated June 2025. Reports for this system disagree, with values from 82 to 99 mg/L.

Conroe on the hardness scale, with nearby cities
060120180240300360+TX typical 112Huntsville: 38 mg/LHuntsville 38Prairie View: 43 mg/LPrairie View 43The Woodlands: 44 mg/LThe Woodlands 44Humble: 52 mg/LHumble 52Willis: 57 mg/LWillis 57Waller: 74 mg/LWaller 74Cleveland: 78 mg/LCleveland 78Tomball: 82 mg/LTomball 82Spring: 86 mg/LSpring 86Magnolia: 144 mg/LMagnolia 144Conroe 82mg/L as calcium carbonate060120180240300360+TX 112The Woodlands: 44 mg/LThe Woodla. 44Willis: 57 mg/LWillis 57Cleveland: 78 mg/LCleveland 78Tomball: 82 mg/LTomball 82Spring: 86 mg/LSpring 86Magnolia: 144 mg/LMagnolia 14482 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 82 mg/L, Conroe is 30 mg/L below the typical Texas figure of 112. Of the 10 nearest cities we track, 7 have softer water and 2 have harder. The range nearby runs from 38 mg/L in Huntsville to 144 in Magnolia.

What 82 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Conroe

3 people × 75 gallons a day × 4.8 gpg = 1,076 grains a day. A 24,000-grain unit regenerates about every 22 days.

Size it for your household

EPA record for Conroe's water system

City of Conroe · PWSID TX1700001

No health-based violations since 2016

Serves about 113,912 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Conroe water hard?

Somewhat. It measures about 82 mg/L (4.8 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Conroe in grains per gallon?

About 4.8 gpg. One grain per gallon equals 17.1 mg/L, so 82 mg/L divided by 17.1 gives 4.8.

What size water softener do I need in Conroe?

For 3 people using 75 gallons each per day, 4.8 gpg works out to about 1,076 grains a day. A 24,000-grain softener covers that with a regeneration about every 22 days.

Has the Conroe water system had EPA violations?

EPA records show no health-based violations for City of Conroe since 2016.

Nearby cities

All 342 cities in Texas

Hardness data: TapWaterData US Water Hardness (utility report, June 16, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.